"I purchased the HR500 looking for an edge in scent control while whitetail hunting. I was skeptical as $500 plus dollars was a big investment. I did the math in all the $ I've spent over the years for cover scents and sprays and came the the conclusion the cost was justified. First day out two mature does came into range, directly down wind, although the deer clearly detected the ozone, they did not detect me and blow. They both came within 30 yards and were within 3 minutes of each other. Don't think twice, this product is a game changer."